Remove non-existent functions declarations from wxOSX/Carbon.

wxMacSetupConverters() and wxMacCleanupConverters() don't seem to exist any
more so don't declare them.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66074 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/carbon/private.h

@@ -946,11 +946,6 @@ UPP Get##x()                                \
 // wxMac string conversions
 //---------------------------------------------------------------------------
 
-void wxMacSetupConverters();
-void wxMacCleanupConverters();
-
-// utils.cpp
-
 // filefn.cpp
 
 WXDLLIMPEXP_BASE wxString wxMacFSRefToPath( const FSRef *fsRef , CFStringRef additionalPathComponent = NULL );